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https://issues.apache.org/jira/browse/AIRFLOW-3958?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16869758#comment-16869758
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ASF GitHub Bot commented on AIRFLOW-3958:
-----------------------------------------
kaxil commented on pull request #4779: [AIRFLOW-3958] List tasks upstream work
in chain
URL: https://github.com/apache/airflow/pull/4779
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> Support list type as upstream in helper.chain
> ---------------------------------------------
>
> Key: AIRFLOW-3958
> URL: https://issues.apache.org/jira/browse/AIRFLOW-3958
> Project: Apache Airflow
> Issue Type: Improvement
> Components: utils
> Affects Versions: 1.10.2
> Reporter: zhongjiajie
> Assignee: zhongjiajie
> Priority: Major
> Labels: patch
> Fix For: 1.10.2
>
>
> For now on, `airflow.utils.helpers.chain` only support list as downstream,
> but not upstream. This ticket is to support list as upstream.
> Only support
> {code:java}
> task_1 --> task_2 --> task_3 --> task_4
> or
> /--> task_3
> task_1 --> task_2
> \--> task_4{code}
> This improvement to be support
> {code:java}
> /--> task_3 \
> task_1 --> task_2 --> task_5
> \--> task_4 /
> {code}
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